1------------------------------------------------------------------------------ 2-- -- 3-- GNAT COMPILER COMPONENTS -- 4-- -- 5-- S Y S T E M . S T O R A G E _ E L E M E N T S -- 6-- -- 7-- B o d y -- 8-- -- 9-- Copyright (C) 1992-2013, Free Software Foundation, Inc. -- 10-- -- 11-- GNAT is free software; you can redistribute it and/or modify it under -- 12-- terms of the GNU General Public License as published by the Free Soft- -- 13-- ware Foundation; either version 3, or (at your option) any later ver- -- 14-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 15-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 16-- or FITNESS FOR A PARTICULAR PURPOSE. -- 17-- -- 18-- As a special exception under Section 7 of GPL version 3, you are granted -- 19-- additional permissions described in the GCC Runtime Library Exception, -- 20-- version 3.1, as published by the Free Software Foundation. -- 21-- -- 22-- You should have received a copy of the GNU General Public License and -- 23-- a copy of the GCC Runtime Library Exception along with this program; -- 24-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- 25-- <http://www.gnu.org/licenses/>. -- 26-- -- 27-- GNAT was originally developed by the GNAT team at New York University. -- 28-- Extensive contributions were provided by Ada Core Technologies Inc. -- 29-- -- 30------------------------------------------------------------------------------ 31 32pragma Compiler_Unit_Warning; 33 34with Ada.Unchecked_Conversion; 35 36package body System.Storage_Elements is 37 38 pragma Suppress (All_Checks); 39 40 -- Conversion to/from address 41 42 -- Note qualification below of To_Address to avoid ambiguities on VMS 43 44 function To_Address is 45 new Ada.Unchecked_Conversion (Storage_Offset, Address); 46 function To_Offset is 47 new Ada.Unchecked_Conversion (Address, Storage_Offset); 48 49 -- Conversion to/from integers 50 51 -- These functions must be place first because they are inlined_always 52 -- and are used and inlined in other subprograms defined in this unit. 53 54 ---------------- 55 -- To_Address -- 56 ---------------- 57 58 function To_Address (Value : Integer_Address) return Address is 59 begin 60 return Address (Value); 61 end To_Address; 62 63 ---------------- 64 -- To_Integer -- 65 ---------------- 66 67 function To_Integer (Value : Address) return Integer_Address is 68 begin 69 return Integer_Address (Value); 70 end To_Integer; 71 72 -- Address arithmetic 73 74 --------- 75 -- "+" -- 76 --------- 77 78 function "+" (Left : Address; Right : Storage_Offset) return Address is 79 begin 80 return Storage_Elements.To_Address 81 (To_Integer (Left) + To_Integer (To_Address (Right))); 82 end "+"; 83 84 function "+" (Left : Storage_Offset; Right : Address) return Address is 85 begin 86 return Storage_Elements.To_Address 87 (To_Integer (To_Address (Left)) + To_Integer (Right)); 88 end "+"; 89 90 --------- 91 -- "-" -- 92 --------- 93 94 function "-" (Left : Address; Right : Storage_Offset) return Address is 95 begin 96 return Storage_Elements.To_Address 97 (To_Integer (Left) - To_Integer (To_Address (Right))); 98 end "-"; 99 100 function "-" (Left, Right : Address) return Storage_Offset is 101 begin 102 return To_Offset (Storage_Elements.To_Address 103 (To_Integer (Left) - To_Integer (Right))); 104 end "-"; 105 106 ----------- 107 -- "mod" -- 108 ----------- 109 110 function "mod" 111 (Left : Address; 112 Right : Storage_Offset) return Storage_Offset 113 is 114 begin 115 if Right > 0 then 116 return Storage_Offset 117 (To_Integer (Left) mod Integer_Address (Right)); 118 119 -- The negative case makes no sense since it is a case of a mod where 120 -- the left argument is unsigned and the right argument is signed. In 121 -- accordance with the (spirit of the) permission of RM 13.7.1(16), 122 -- we raise CE, and also include the zero case here. Yes, the RM says 123 -- PE, but this really is so obviously more like a constraint error. 124 125 else 126 raise Constraint_Error; 127 end if; 128 end "mod"; 129 130end System.Storage_Elements; 131